Skin treatment apparatus



FIG. 1 is a perspective view of a skin treatment apparatus, showing mynew design from the top and left side;

FIG. 2 is a perspective view thereof, from rear and right side;

FIG. 3 is a right side elevation view thereof; and,

FIG. 4 is a top plan view thereof.

The ornamental design for a skin treatment apparatus, as shown anddescribed.